gleaming claymore of ruin possible bugged?

[Dnadnnoid]

when i use it i run out of AP even though i have 10. I figured i'd just mention it in case it's a bug of some sort.

[Pyrizzle]

Gleaming Claymore of Ruin:
Stats:
AP (Attack Cost) 5AP
AC: +35%
AD: 3-7
CHS: 5
CM: 2.5
BC: -7%
On hit:
30% chance of Daze (On Target)
15% chance of Strength (On you)

A few questions:
1) If you open up the player menu what does it say your Attack Cost is currently? It should say 5AP if you don't have anything that is currently modifying it (Like the jewel of Fallhaven, or the stone Cuirass)

2) Do you have any current status effects that might be effecting your AP as well. (Like Fatigue or Blackwater Misery)

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I really doubt that this is a bug and am fairly certain that it is from a simple overlook.

Let me know if you figured it out or are still stuck.

Happy hunting!
-The Fire Lord, Pyro